dvse

SR-007 HE60, Lambda Signature SR-404, 4070 SR-202, Lambda Pro HD650, HD580 (I might very well be deaf but the 2 sound virtually identical - also don't Sennheiser use the same driver and 'capsule' parts for both?)

I wonder how many owners that pair has changed over the last 2 years - I think at least 4?

Hello everyone! This forum feels like some sort of parallel world - all the names are familiar yet something is unsettling and different! ; p Yes, definitely it would be a big surprise if SR-007 Mk2 is significantly less efficient - then it may even be difficult to get reasonable volume with some of the quieter single ended sources and the Stax amps.